I decided to post this info again on this forum since the question comes up several times a month
Attached below are the install instructions for the 2" torsion shackle lift. The pictures below show before and after the 2" shackle torsion lift with the 265 70R16 tires. This lift has proved to be cheap, strong, reliable, and all around cool. You can raise the front by 2" and the rear shckles will lift the back by 1.75". I run with my 2" lift in the front. This gives my D a bit of a nose up look.
This is an easly lift and can be done in your garage or driveway in less than 2 hours. After having done it once, I could probably do it in under 1 hour. Lifting the front is simple and requires jacking up the front, putting the D on jackstands, and tightening the torsion bar adjusting bolt. This takes alot of torque, but I did mine by hand. Many have expressed concerns over problems with a torsionbar lift. I have researched this lift for over 2 years. I have seen very very few owners reports of any problems resulting from this lift. The driveshafts seem to handle the driveangle change without complaint. The setup can use stock length shocks without accelerated wear. The balljoints are not stressed any more with the lift than with stock height.
There are 2 manufacturer for the lifting shackles. Western and Beltech. The Western shackle (Part # 2001) can be purchased from Macssprings.com http://www.macsspring.com/website/we...ackleframe.htm
The Beltech 6700 shackles can be purchased from Summit Racing: http://store.summitracing.com/partde...6700&view=2047
Although these shackles are advertised to be a 1" drop for a chevy, they also work nicely to give 2" lift to a Durango. They have been in Durangos for years and many have put over 100K miles on the lifted suspension without trouble.
I have used both shackles and consider them of equal strength. My first set (Western) bent in an accident and I replaced them with the Beltechs. I was told the Beltechs were heavier duty, but this is incorrect. Both Shackles use the same thickness of steel. The only real difference is the color of the shackles. Beltechs are black and the Westerns are grey. Mounting dimensions are identical. There are very minor differences in location and shape of the lightening holes. I would recommend using the Western Shackles since they are much cheaper.
Many wonder if an alignment is needed. I didn't get one and I had no uneven tire wear. I have never even read any posts reporting uneven tire wear from this lift. But, if paying $75 - $100 for an alignment makes you feel better, by all means go get that alignment. The shop guys will thank you.
Dodge uses a 30.7" dia x 10.5" wide (265 70R16) as the largest diameter stock tire. By using a 2" shackle/torsion lift (under $100) you can fit 32" x 10.5" tires without rubbing. Wider tires will rub, but some have used 11.5" tires with the 2" lift with minimal rubbing when at full turn. By using a 3" Rancho lift ($1500 - $2500), you can still only fit 32" x 10.5" tires without rubbing. By using a 3" body lift ($300 - $800), you can fit 33" tires x 11.5" tires without rubbing.
You can go bigger than 33" with a solid axle lift, Tuff Country lift, or others (beware the dangerous Whiplash lift). While possible to go bigger than 33", it is very expensive and will degrade the street performance of your D to a level that most (but not all) find undesireable. Remember that bigger tires mean lower milage, poorer braking performance, loss of power, etc... Make sure you are willing live with these side effects before making the costly upgrade to new tires and a lift.
The front axle of a stock Durango is generally considered only moderately strong. Generally a 32" max tire size is recommended, although many have offroaded successfully for thousands of miles with 33's. Hardcore offroading with anything larger than 32's may cause your front diff to go boom.
If you go bigger than 31" tires, you will probably want to upgrade your brake system. The Durango and Dak have pitifully weak brakes and larger tires need more braking power. Upgrading to powerslot rotors and hawk pads may do the trick, or you can install rear disk brakes in place of the stock drums for $1000 - $1500.